CN202196108U - Data acquisition device capable of achieving automatic range - Google Patents
Data acquisition device capable of achieving automatic range Download PDFInfo
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- CN202196108U CN202196108U CN2011201630787U CN201120163078U CN202196108U CN 202196108 U CN202196108 U CN 202196108U CN 2011201630787 U CN2011201630787 U CN 2011201630787U CN 201120163078 U CN201120163078 U CN 201120163078U CN 202196108 U CN202196108 U CN 202196108U
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Abstract
The utility model discloses a data acquisition device, which comprises an input end, a plurality of amplifiers, a plurality of analog to digital converters and a controller. The input end is used for receiving measurement signals, each amplifier has different amplification factors and is coupled to the input end, each analog to digital converter is coupled to a corresponding amplifier so that amplifying signals output by the amplifiers are carried out analog to digital conversion so as to obtain digital amplifying signals, and the controller is coupled to each analog to digital converter and selects the digital amplifying signals coming from one of the plurality of amplifiers to serve as output signals according to magnitude of the measurement signals and output voltage ranges of the data acquisition device. The data acquisition device can automatically switch ranges according to the magnitude of the signals, and can guarantee signal measurement accuracy.
Description
Technical field
The utility model relates to the data acquisition technology of measuring-signal size, relates in particular to through analog to digital conversion to come Dynamic Signal is carried out the data measured collecting device.
Background technology
Existing data acquisition equipment with multiple range generally comprises an amplifier and an analog to digital converter; Wherein amplifier amplifies measuring-signal; To pass through the analog signal conversion that amplifier amplifies be digital signal to analog to digital converter subsequently, to realize signals collecting.Because the input voltage range and the precision of analog to digital converter are certain, the size of measuring-signal then possibly alter a great deal in practice, for guaranteeing the precision (mainly showing as signal to noise ratio (S/N ratio)) of signal measurement, need under different ranges, measure.
In data acquisition equipment; In order to adapt to the size of measuring-signal; Generally can suitable amplifier magnification ratio be set, thereby can realize the signal measurement (range=analog to digital converter input voltage range/enlargement factor) of different ranges according to the size of measured signal.Therefore in data acquisition equipment,,, thereby guarantee that signal can not transship for amplifier is provided with less enlargement factor with the bigger range of acquisition for bigger signal; And for less signal, then for the bigger enlargement factor of amplifier setting obtaining less range, thereby guarantee that signal can underload (being not that signal to noise ratio (S/N ratio) is not enough).
Yet, in existing data acquisition equipment, need the enlargement factor of artificially resonance-amplifier usually and can not automatically switch to suitable enlargement factor and range according to signal magnitude.Therefore, before the enlargement factor of amplifier is set, usually need rule of thumb, the size of method prevision measuring-signals such as preliminary experiment, simulation calculation, through the manual knob mode enlargement factor is set then.This mode causes data acquisition equipment can't carry out work automatically.
In addition, in existing data acquisition equipment, adopted modes such as software program control that enlargement factor is set.Though this control mode has reduced manual operation, still can't realize automatic range, all the more so for fast-changing Dynamic Signal.This is because amplifier belongs to electronic devices and components, after changing parameter, all must just can reach stable through after a while.So in the continuous real-time measuring process, if change the enlargement factor of amplifier, then reach in stable a period of time before, its measurement data is insecure.Therefore this control mode can't provide the signals collecting result with enough accuracy.
Therefore, needed be a kind of can be according to the signal magnitude automatic switching range, and can also guarantee the new data collection equipment of signal measurement precision.
The utility model content
In view of the above problems, having proposed the utility model overcomes the problems referred to above or solves at least in part or slow down the data acquisition equipment of the problems referred to above so that provide a kind of.
An aspect according to the utility model provides a kind of data acquisition equipment of realizing automatic range, comprises input end, is used to receive measuring-signal; A plurality of amplifiers, wherein each amplifier have different magnifications and be couple to the input bring in the reception measuring-signal, each amplifier amplifies the amplifying signal that has different amplification with output to the measuring-signal that is received respectively; A plurality of analog to digital converters, each analog to digital converter is couple to corresponding amplifier, so that the amplifying signal of respective amplifier output is carried out analog to digital conversion to obtain the digital amplifying signal through conversion; And controller; Be couple to each analog to digital converter in a plurality of analog to digital converters receiving the digital amplifying signal from respective amplifier, its middle controller selects amplifying signal from one of a plurality of amplifiers as exporting signal according to the input voltage range of the size of measuring-signal and respective mode number converter.
Alternatively; In the data acquisition equipment according to the utility model, the digital amplifying signal that the amplifier that controller selects to have size maximum, that can not cause measuring-signal and enlargement factor in the middle of a plurality of amplifiers product exceeds the enlargement factor of input voltage range export and changed via the respective mode number converter is as exporting signal.
Alternatively, in the data acquisition equipment according to the utility model, a plurality of amplifiers comprise the single times of amplifier that measuring-signal is not amplified.
Alternatively; In data acquisition equipment according to the utility model; A plurality of amplifiers comprise 2 amplifiers, 3 amplifiers or 4 amplifiers, and a plurality of amplifier also comprises in 100 times of amplifiers, 10000 times of amplifiers and the 1000000 times of amplifiers one or more.
Alternatively, in the data acquisition equipment according to the utility model, a plurality of analog to digital converters are 12,16 or 24 analog to digital converters.
Break the thinking constraint of only gathering for a drive test amount signal originally with an AD analog to digital converter according to the data acquisition equipment of the utility model; But use a plurality of AD analog to digital converters to sample synchronously to every drive test amount signal; And before each AD analog to digital converter, use to have difference but the amplifier of fixing enlargement factor amplifies, like this digital signal with regard to having obtained simultaneously under a plurality of ranges, measuring.Subsequently, the signal of the amplifier output of the maximum multiple of suitable this measuring-signal size of controller selection is as final acquired signal.Because controller only relates to the processing of carrying out to digital signal, and the components and parts in the analog signal transmission is not carried out any parameter change, so the utility model can be selected suitable range in real time, the data acquisition of realization automatic range when signal changes.
Description of drawings
Through reading the hereinafter detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing only is used to illustrate the purpose of preferred implementation, and does not think the restriction to the utility model.And in whole accompanying drawing, represent identical parts with identical reference symbol.In the accompanying drawings:
Fig. 1 shows the block diagram according to the data acquisition equipment of an embodiment of the utility model; And
Fig. 2 shows the block diagram according to the controller in the data acquisition equipment of an embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment the utility model is done further to describe.Fig. 1 shows the block diagram according to the data acquisition equipment 100 of an embodiment of the utility model.As shown in Figure 1, data acquisition equipment 100 comprises input end 110, is used to receive measuring-signal.Measuring-signal is generally simulating signal.In the embodiment shown in fig. 1, show data acquisition equipment 100 and only receive a drive test amount signal, yet in practice, this data acquisition equipment 100 can receive the multichannel measurement signal.Because for every drive test amount signal, data acquisition equipment 100 has adopted similar treatment circuit to handle, therefore, only show a drive test amount signal among Fig. 1 from for purpose of brevity.But the utility model is not limited to this, but goes for process multi-channel measuring-signal simultaneously.
Because the signal that input end 110 is received is generally simulating signal, therefore, data acquisition equipment 100 also comprises a plurality of analog to digital converters 130
1, 130
2With 130
3Wherein each analog to digital converter all is disposed in the amplification path, for example is coupled in respective amplifier 120
1, 120
2..., 120
3And between the controller 140, so that the amplifying signal of respective amplifier output is carried out analog to digital conversion and will send to controller 140 through the digital amplifying signal after the conversion.The type of a plurality of analog to digital converters that in general adopted is identical, has identical input voltage range.
The utility model is not limited to the type of analog to digital converter, but the analog to digital converter of selecting to have higher figure place can obtain bigger automatic range scope.Usually analog to digital converter has types such as 12,16 and 24; Be approximately 60dB, 80dB and 120dB respectively with the corresponding scope of measuring Dynamic Signal of these types, this be equivalent to respectively about 1E3 (1000) doubly, 1E4 (10000) doubly with 1E6 (1000000) times scope.Therefore select 24 analog to digital converters can be than the range ability of 1000 times of other two kinds of analog to digital converters acquisitions of Duo and 100 times.
Particularly; Controller 140 is at first selected to come the preliminary size of confirming measuring-signal from the digital amplifying signal of the amplifier with minimum enlargement factor, and the digital amplifying signal that the amplifier of enlargement factor that the product of in the middle of a plurality of amplifiers, selecting to have size maximum, that can not cause measuring-signal and enlargement factor then exceeds the input voltage range of respective mode number converter export and changed via the respective mode number converter is as exporting signal.
As stated, range=analog to digital converter input voltage range/enlargement factor.Owing to the analog to digital converter that adopts on every amplification path generally is identical; And the input voltage range of analog to digital converter is also corresponding to the output voltage range of data acquisition equipment 100; Therefore; The selection that controller 140 is carried out also can be to use the amplifying signal of maximum range to come the preliminary size of confirming measuring-signal, and the amplifying signal of selecting then to satisfy the big or small minimum range of measuring-signal is as the output signal, promptly as final image data.
Fig. 2 shows the block diagram according to the controller 140 in the data acquisition equipment 100 of an embodiment of the utility model.Controller 140 shown in Figure 2 is suitable in data acquisition equipment shown in Figure 1 100, using.As shown in Figure 2, controller 140 has three way word amplifying signals input 141
1, 141
2With 141
3, correspond respectively to single times of amplifier, 100 times of amplifiers and 10000 times of amplifying signals that amplifier is exported.Controller 140 comprises that also being coupled in three the tunnel respectively imports 141
1, 141
2With 141
3And the gating circuit 143 between the controller output 144
1, 143
2With 143
3Gating circuit 143
1, 143
2With 143
3By 142 controls of control module, particularly, the gating signal 145 of difference origin Self Control unit 142
1, 145
2With 145
3Gating is so that export 144 with corresponding amplifying signal input and output to controller.
On the contrary, if digital signal 141
1Greater than with 10000 times of corresponding ranges of amplifier, then then by second judging unit 142
2Judge this digital signal 141
1Whether less than with 100 times of corresponding ranges of amplifier, if then launch gating signal 145
2So that gating circuit 143
2By gating, thereby will output to output terminal 144 from the digital amplifying signal after analog to digital conversion of 100 times of amplifiers.
On the contrary, if digital signal 141
1Greater than with 100 times of corresponding ranges of amplifier, then launch gating signal 145
1So that gating circuit 143
1By gating, thereby will output to output terminal 144 from the digital amplifying signal after analog to digital conversion of single times of amplifier.
Though Fig. 2 is that example is illustrated with the controller 140 that is suitable for three amplifiers; But those skilled in the art can be expressly understood that according to example shown in Figure 2 can make amendment to this controller 140 not to exceed the scope of the utility model so that be suitable for the controller of different numbers and enlargement factor.
Particularly; Controller 140 is according to the enlargement factor order from high to low of a plurality of amplifiers; Judge successively whether the product of size and this enlargement factor of measuring-signal exceeds the input voltage range of respective mode number converter; If do not exceed, then select from the corresponding amplifier of this enlargement factor and via the digital amplifying signal of respective mode number converter conversion as the output signal.
Can be automatically switch on the suitable range according to the data acquisition equipment of the utility model, and can satisfy signal dynamics variation range up to 160dB, 200dB or 240dB according to the size of measured signal.Through when the very big signal of dynamic change especially variation range is measured, need not to consider signal magnitude and range problem, just can guarantee the fiduciary level and the precision of signal measurement.
Should be noted in the discussion above that in each parts of the controller of the utility model especially control module, according to its function that will realize and wherein parts have been carried out logical partitioning; But; The utility model is not subject to this, can repartition or make up each parts as required, for example; Can be single parts with some unit constructions, perhaps can some parts further be decomposed into more subassembly.
Each controller embodiment of the utility model can realize with hardware, perhaps realizes with the software module of on one or more processor, moving, and perhaps the combination with them realizes.It will be understood by those of skill in the art that and to use microprocessor or digital signal processor (DSP) or FPGA to realize in practice according to some or all some or repertoire of parts in the controller of the utility model embodiment.
It should be noted that the foregoing description describes the utility model rather than the utility model is limited, and those skilled in the art can design alternative embodiment under the situation of the scope that does not break away from accompanying claims.In claim, should any reference symbol between bracket be configured to the restriction to claim.Word " comprises " not to be got rid of existence and is not listed in element or step in the claim.Being positioned at word " " or " " before the element does not get rid of and has a plurality of such elements.The utility model can be realized by means of the hardware that includes some different elements and by means of the computing machine of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to come imbody through same hardware branch.Any order is not represented in the use of word first, second and C grade.Can be title with these word explanations.
Claims (8)
1. data acquisition equipment of realizing automatic range is characterized in that comprising:
Input end is used to receive measuring-signal;
A plurality of amplifiers, wherein each amplifier have different magnifications and be couple to the input bring in the reception measuring-signal, each amplifier amplifies the amplifying signal that has different amplification with output to the measuring-signal that is received respectively;
A plurality of analog to digital converters, each analog to digital converter are couple to the respective amplifier in said a plurality of amplifier, so that the amplifying signal of respective amplifier output is carried out analog to digital conversion to obtain the digital amplifying signal through conversion; And
Controller; Be couple to each analog to digital converter in said a plurality of analog to digital converter receiving the digital amplifying signal from respective amplifier, wherein said controller selects the digital amplifying signal after the conversion of respective mode number converter in the lump from a plurality of amplifiers as exporting signal according to the input voltage range of the size of said measuring-signal and respective mode number converter.
2. data acquisition equipment as claimed in claim 1; It is characterized in that the digital amplifying signal that the amplifier that said controller selects to have size maximum, that can not cause said measuring-signal and enlargement factor in the middle of said a plurality of amplifiers product exceeds the enlargement factor of said input voltage range export and changed via the respective mode number converter is as exporting signal.
3. data acquisition equipment as claimed in claim 2; It is characterized in that; Said controller is according to the enlargement factor order from high to low of said a plurality of amplifiers; Judge successively whether the size of said measuring-signal and the product of this enlargement factor exceed said input voltage range, if do not exceed, then select with the corresponding amplifier output of this enlargement factor and via the digital amplifying signal of respective mode number converter conversion as the output signal.
4. like any described data acquisition equipment among the claim 1-3, it is characterized in that said a plurality of amplifiers comprise the single times of amplifier that said measuring-signal is not amplified.
5. data acquisition equipment as claimed in claim 4 is characterized in that said a plurality of amplifier comprises 2 amplifiers, 3 amplifiers and 4 amplifiers.
6. data acquisition equipment as claimed in claim 4 is characterized in that said a plurality of amplifier also comprises one or more in 100 times of amplifiers, 10000 times of amplifiers and the 1000000 times of amplifiers.
7. like any described data acquisition equipment among the claim 1-3, it is characterized in that said a plurality of analog to digital converter is 12,16 or 24 analog to digital converters.
8. data acquisition equipment as claimed in claim 7 is characterized in that, said a plurality of analog to digital converters have identical type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201630787U CN202196108U (en) | 2011-05-20 | 2011-05-20 | Data acquisition device capable of achieving automatic range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201630787U CN202196108U (en) | 2011-05-20 | 2011-05-20 | Data acquisition device capable of achieving automatic range |
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| Publication Number | Publication Date |
|---|---|
| CN202196108U true CN202196108U (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201630787U Expired - Lifetime CN202196108U (en) | 2011-05-20 | 2011-05-20 | Data acquisition device capable of achieving automatic range |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297703A (en) * | 2011-05-20 | 2011-12-28 | 北京东方振动和噪声技术研究所 | Data collection equipment and method thereof |
| CN102944712A (en) * | 2012-11-26 | 2013-02-27 | 西安华伟光电技术有限公司 | Multi-range automatic selection device of electronic type current transformer |
| CN105242104A (en) * | 2015-10-13 | 2016-01-13 | 欣旺达电子股份有限公司 | Current detection method, current detection device, and current detector |
| CN105372469A (en) * | 2014-08-13 | 2016-03-02 | 浙江巨磁智能技术有限公司 | Method for adjusting measuring range of current sensor and sensor utilizing the method |
| CN105468074A (en) * | 2015-12-17 | 2016-04-06 | 中国电子科技集团公司第四十一研究所 | Seamless access voltage and current gear-shifting control system |
| CN108344888A (en) * | 2018-01-26 | 2018-07-31 | 中国人民解放军战略支援部队信息工程大学 | Small signal circuit detection device and its method in communication line based on circuit transmission |
-
2011
- 2011-05-20 CN CN2011201630787U patent/CN202196108U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297703A (en) * | 2011-05-20 | 2011-12-28 | 北京东方振动和噪声技术研究所 | Data collection equipment and method thereof |
| CN102944712A (en) * | 2012-11-26 | 2013-02-27 | 西安华伟光电技术有限公司 | Multi-range automatic selection device of electronic type current transformer |
| CN105372469A (en) * | 2014-08-13 | 2016-03-02 | 浙江巨磁智能技术有限公司 | Method for adjusting measuring range of current sensor and sensor utilizing the method |
| CN105242104A (en) * | 2015-10-13 | 2016-01-13 | 欣旺达电子股份有限公司 | Current detection method, current detection device, and current detector |
| CN105468074A (en) * | 2015-12-17 | 2016-04-06 | 中国电子科技集团公司第四十一研究所 | Seamless access voltage and current gear-shifting control system |
| CN105468074B (en) * | 2015-12-17 | 2017-03-29 | 中国电子科技集团公司第四十一研究所 | A kind of seamless access voltage x current shifting control system |
| CN108344888A (en) * | 2018-01-26 | 2018-07-31 | 中国人民解放军战略支援部队信息工程大学 | Small signal circuit detection device and its method in communication line based on circuit transmission |
| CN108344888B (en) * | 2018-01-26 | 2020-07-10 | 中国人民解放军战略支援部队信息工程大学 | Circuit transmission-based small signal circuit detection device and method in communication line |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120418 |